Tandem road roller



y 1, 1950 H. w. LEWIS 2,514,711

TANDEM ROAD ROLLER Filed Aug. 12, 1946 2 Sheets-Sheet 1 ghwzntoz H. W.Lewis artoznm a,

July 11, 1950 H. w. LEWIS 2,514,711

TANDEM ROAD ROLLER Filed Aug. 12, 1946 2 Sheets-Sheet 2 I Fig.2.

gnucmfoz H. Lewuls Patented July 11, 1950 UNITED STATES PATENT OFFICEThis invention relates to tandem road rollers, one of the objects beingto provide a roller which permits road rolling operations to be carriedclose to obstructions, such as curbs, building forms,

etc., for a greater height than heretofore has been possible.

vAs far as the applicant. is aware all tandem rollers thus fardevelopedmake allowance for a certain distance of ,roadsurface adjacentto suchobstructions which must be left unrolled ,due-to' the overhangingframes and driving mechanism.

It isan object of the present invention to avoid this objectionablefeature by driving and braking the roller from inside the roller edgesso the rollers thus can be brought up to the curb or other sideobstruction.

With the foregoing and other objects in view which appear as thedescription proceeds, the invention consists of certain novel details ofconstruction and combinations of parts hereinafter more fully describedand pointed out in the claims, it being understood that changes may bemade in the construction and arrangement of parts without departing fromthe spirit of the invention as claimed.

In the accompanying drawings the preferred form of the invention hasbeen shown.

In said drawings:

Figure 1 is a side elevation of the tandem 1 roller, parts being brokenaway.

Figure 2 is a vertical transverse section showing the drive mechanismfor the roller, said mechanism being located at one side of the roller.

Figure 3 is an elevation of a portion of the machine showing the bearingat the opposite side of said roller.

Referring to the figures by characters of reference, l designates thebody of the twin roller which can be of any suitable design andproportions, it merely being essential that all portions of this body belocated well above the level of the axes of rotation of the front andback rollers. The term body as here used means every part of the roadrolling machine except the motor, rollers, and power transmissionextending from the motor to the driven roller. This body carries asuitable motor indicated generally at 2 adapted to transmit motion byany suitable means, such as a pulley or sprocket 3 through a belt orchain 4 to a pulley or sprocket 5 forming part of a suitabletransmission 6 which has not been illustrated in detail but which can beof any type such as commonly employed for the purpose of obtaining thedesired speed and directional cha s i e. mo e nt c hemec ani m 1A poweake Qf s ai i e e d dlat ra l rom andiorms a par of the tr nsm si n d ro.aectsin o a-nar cw ho 8 loca ed on one. e

c ethe ody I. .A p t 9 or the like sqar d b th p on time s a t w i t was8 and serves o ra smitm on h ou h chain lfl orthe like toanothersprocket 11 also "located in the housin 8. h s s c et H or helikelislocated at the outer end of a shaft I2, the inner endof which issupported :withinone of the open ends of a road roller l3,

Asshown particularly iuFis-ur 2 hi o r I3 h s s eads I4 se inward om t eends o th er \so that am l ance h s i le b w en o e of the heads and theadjacent end of the roller to accommodate that portion of the drivingmechanism which is located at points below the axis of rotation of theroller. Both heads of the roller are set inwardly as shown in Figure 2and are joined by a tubular core l5. In this core is centered a shaft I6which is extended loosely through bearings l6 joined to the heads androtatable with the core. The ends of the shaft are secured firmly tohearing brackets H, the upper ends of which are attached to the innersides of the superstructure consisting of the body I and the housing 8,these brackets being extended downwardly along converging lines so thatthe lower ends thereof to which the shaft [6 is attached are supportedwell within the space defined by the ends of the roller 13.

The inner end of the shaft 12 is extended into the space defined by theadjacent end of roller l3 and carries a sprocket 18 or the like adaptedto transmit motion by a chain or other means I9 to a sprocket 20 whichis completely surrounded by the adjacent open end of the drum or roller13, said sprocket being attached to the adjacent head M of the roller bymeans of connecting bolts or lugs 2 I.

It is to be understood, of course, that the front roller 22 will alsohave open ends with the inset heads 23 so that the brackets 24 whichconnect the roller to the main structure will not project beyond thesides of the rollers at any point below the axis of rotation of theroller.

It is thought that the advantages of the present structure will beapparent from the foregoing. There is no part of the structure below theaxle of the roller which projects laterally beyond the ends of theroller where it could contact with a curb, form or other obstruction atthe side of the road. The motor indicated generally at 2, whileextending below the body I, is set inwardly the side walls; front andrear rollers mounted on motor to one roller for driving said roller,said transmission extending upwardly from the motor to the side wall,along the side wall to the driven roller, and to the enclosed upperportion of the driven roller, said transmission including transmissionelements extending from a point along the side wall to the driven rollerbelow, said elements being disposed inwardly of one end of said roller,said axles being carried by the side walls therebelow, all portions ofsaid body, motor, andtransmission that are lower than the axle of thedriven roller being confined to a space defined between the ends of saidroller, so that below its the axles; a motor mounted on the body; and

means mounted on one side wall and extending from the motor to oneroller for driving said roller, saidmeans including transmission ele-,ments extending from a point along the sidev wall to the driven rollerbelow, said elements being disposed inwardly of one end of said roller,said axles being carried by the side walls therebelow, all portions ofsaid body, motor, and drive means that are lower than the axle of thedriven roller being confined to a space defined between the ends of saidroller, so that below its axle, the ends of said roller are theoutermost parts of the machine at opposite sides of the machine.

2. In a road rolling machine a body including depending side walls;spaced axles carried by the side walls; front and rear rollers mountedon the axles and having their upper portions enclosed by the side walls;a motor mounted on the body and confined within an area bounded at itsends by the rollers and at its sides by the side walls; and a powertransmission extending from the axle, the ends of said roller are theoutermost parts of the machine at opposite sides of the machine.

HARDY W. LEWIS.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 939,877 Todd et al Nov. 9, 19091,345,109 Seeley June 29, 1920 2,154,720 Biles Apr. 18, 1939 2,334,086Greiner Nov. 9, 1943 FOREIGN PATENTS Number Country Date 230,769 GreatBritain Mar. 19, 1925 318,955 Great Britain Sept. 13,1929 553,419Germany June 28, 1932

